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This is a helical coil heat exchanger used in indirect water heater. 

- Outer Coil Material: 304 Stainless Steel (316L, 321, etc. Stainless Steel available to order)
- Inner Coil Material: Copper
- Tubing Dimensions for Inner and Outer Coil (O.D.×Thickness, in./mm): 0.375" × 0.020"/ 9.52mm × 0.5mm
- Coil Dimensions(Coil O.D x Length x Turns in./mm): 9" x 12" x 40 / 228.6mm x 304.8mm x40

Rectangular Cooling Coil with copper coil inside

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